我有两个c文件：

AC

void main(){
    ...
    getvtable()->function();
}

vtable指向一个位于bc中的函数：

void function(){
    malloc(42);
}

现在如果我在valgrind中跟踪程序，我会得到以下结果：

==29994== 4,155 bytes in 831 blocks are definitely lost in loss record 26 of 28
==29994==    at 0x402CB7A: malloc (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==29994==    by 0x40A24D2: (below main) (libc-start.c:226)

所以函数调用在堆栈上完全忽略！这怎么可能？在使用GDB的情况下，会显示包含“功能”的正确堆栈。

包含调试符号，Linux，32位。

UPD：

回答第一个问题时，我在调试valgrind的GDB服务器时得到以下输出。当我直接使用GDB进行调试时，断点不会到来。

stasik@gemini:~$ gdb -q
(gdb) set confirm off
(gdb) target remote | vgdb
Remote debugging using | vgdb
relaying data between gdb and process 11665
[Switching to Thread 11665]
0x040011d0 in ?? ()
(gdb) file /home/stasik/leak.so
Reading symbols from /home/stasik/leak.so...done.
(gdb) break function
Breakpoint 1 at 0x110c: file ../../source/leakclass.c, line 32.
(gdb) commands
Type commands for breakpoint(s) 1, one per line.
End with a line saying just "end".
>silent
>end
(gdb) continue
Continuing.

Program received signal SIGTRAP, Trace/breakpoint trap.
0x0404efcb in ?? ()
(gdb) source thread-frames.py
Stack level 0, frame at 0x42348a0:
 eip = 0x404efcb; saved eip 0x4f2f544c
 called by frame at 0x42348a4
 Arglist at 0x4234898, args:
 Locals at 0x4234898, Previous frame's sp is 0x42348a0
 Saved registers:
  ebp at 0x4234898, eip at 0x423489c
Stack level 1, frame at 0x42348a4:
 eip = 0x4f2f544c; saved eip 0x6e492056
 called by frame at 0x42348a8, caller of frame at 0x42348a0
 Arglist at 0x423489c, args:
 Locals at 0x423489c, Previous frame's sp is 0x42348a4
 Saved registers:
  eip at 0x42348a0
Stack level 2, frame at 0x42348a8:
 eip = 0x6e492056; saved eip 0x205d6f66
 called by frame at 0x42348ac, caller of frame at 0x42348a4
 Arglist at 0x42348a0, args:
 Locals at 0x42348a0, Previous frame's sp is 0x42348a8
 Saved registers:
  eip at 0x42348a4
Stack level 3, frame at 0x42348ac:
 eip = 0x205d6f66; saved eip 0x61746144
---Type <return> to continue, or q <return> to quit---
 called by frame at 0x42348b0, caller of frame at 0x42348a8
 Arglist at 0x42348a4, args:
 Locals at 0x42348a4, Previous frame's sp is 0x42348ac
 Saved registers:
  eip at 0x42348a8
Stack level 4, frame at 0x42348b0:
 eip = 0x61746144; saved eip 0x65736162
 called by frame at 0x42348b4, caller of frame at 0x42348ac
 Arglist at 0x42348a8, args:
 Locals at 0x42348a8, Previous frame's sp is 0x42348b0
 Saved registers:
  eip at 0x42348ac
Stack level 5, frame at 0x42348b4:
 eip = 0x65736162; saved eip 0x70616d20
 called by frame at 0x42348b8, caller of frame at 0x42348b0
 Arglist at 0x42348ac, args:
 Locals at 0x42348ac, Previous frame's sp is 0x42348b4
 Saved registers:
  eip at 0x42348b0
Stack level 6, frame at 0x42348b8:
 eip = 0x70616d20; saved eip 0x2e646570
 called by frame at 0x42348bc, caller of frame at 0x42348b4
 Arglist at 0x42348b0, args:
---Type <return> to continue, or q <return> to quit---
 Locals at 0x42348b0, Previous frame's sp is 0x42348b8
 Saved registers:
  eip at 0x42348b4
Stack level 7, frame at 0x42348bc:
 eip = 0x2e646570; saved eip 0x0
 called by frame at 0x42348c0, caller of frame at 0x42348b8
 Arglist at 0x42348b4, args:
 Locals at 0x42348b4, Previous frame's sp is 0x42348bc
 Saved registers:
  eip at 0x42348b8
Stack level 8, frame at 0x42348c0:
 eip = 0x0; saved eip 0x0
 caller of frame at 0x42348bc
 Arglist at 0x42348b8, args:
 Locals at 0x42348b8, Previous frame's sp is 0x42348c0
 Saved registers:
  eip at 0x42348bc
(gdb) continue
Continuing.

Program received signal SIGTRAP, Trace/breakpoint trap.
0x0404efcb in ?? ()
(gdb) continue
Continuing.